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Because the volume of spam has increased from about 10 percent of all e-mail in 2001 to more than 50 percent today, corporations and ISPs have been trying to find ways to keep the junk mail from overwhelming users' inboxes. Filtering products, which rely on several techniques to separate needed messages from unwanted solicitations, have helped cut down on the bulk-mail deluge. However, these filtering products have a dark side: They can inadvertently block wanted messages, often without the user ever being aware of the block.

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